JAAS Configuration for WebLogic

I need to use JAAS authentication from my web application which is deployed on WebLogic. Where do I specify which is the configuration file (containing the login module information) that should be used by JAAS?

hi i am also facing the same issue while using weblogic 9. but i donot want to set the property at the startup as my other applications deployed on the server might be affected. is there any other way?